Season 9 Episode Guide

A couple worry that their Lab, who becomes aggressive around food, could hurt their 18-month-old son. The host also helps socialize a homeless woman's protective pit bull so they can move into a women's shelter.

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Exercise guru Jillian Michaels seeks Cesar's help for a second time, wanting to ensure that her rescued Chihuahua won't get aggressive with her young daughter. Later, the host helps Kelsey Grammer and his wife, Kayte, potty train their pooches.

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Robert Schwartzman, lead singer of the rock band Rooney, seeks help taming his adopted pit bull, Sandy, who's aggressive around other dogs. Also: comic-book artist Paul Lee has two adopted Boston terriers that don't get along.

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In London, the host meets two dogs that have spent most of their lives in Africa and are having trouble adjusting to their new surroundings. He also works with a Jack Russell terrier that acts up around guests, and a dog walker who struggles to control her own Patterdale-terrier mix.

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The host continues his U.K. tour in London, where he meets a pup named Herbie who must be muzzled in public because of past bad behavior. Also: a pair of German shepherd littermates have grown wild and dominant with one another; an English cocker spaniel refuses to ride in cars.

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Cesar Millan travels to the U.K. to help troubled dog owners in the Season 9 opener. Included: a 17-year-old gets help handling his two out-of-control Jack Russell terriers; a rescue dog's territorial behavior is addressed.